REPORT ON THE BRACHYURA. 
273 
to be insufficient, is to be regarded as merely a variety of the Atlantic Plagusict 
depressa. 
Adult 3 • Lines. Millims. 
Length of carapace, nearly . . . . . .21 44 
Breadth of carapace, nearly ...... 22-1 47 '5 
Plagusict immaculata, Lamarck (PI. XXII. fig. 1). 
Plagusia immaculata, Lamarck, Hist. Anim. sans Vert., v. p. 247, 1818. 
,, „ Miers, Ann. and Mag. Nat. Hist., tom. cit, p. 150, 1878. 
,, depressa, Latreille, Encycl. M4th. , x. p. 145, 1825. 
,, „ Milne Edwards, Hist. Nat. Crust., vol. ii. p. 93, 1837; Ann. d. Sci. Nat., 
ser. 3, Zool., vol. xx. p. 179, 1853, nec Cancer depressus, Fabricius. 
North of New Guinea, from driftwood, February 21, 22, 1875 (a female and several 
small males). 
The largest male measures as follows : — 
«J. 
Lines. 
Millims. 
Length of carapace, nearly 
8J 17-5 
Breadth of carapace, .... 
9 
19 
It is possible that this form, like the preceding, may prove to be merely a small 
convex, smoother and glabrous variety of Plagusia depressa, but I hesitate to unite it 
with that species on the authority of the series at present contained in the collection of 
the British (Natural History) Museum and in the Challenger collection. 1 
Plagusia chabrus (Linne) (PI. XXII. fig. 1 cl). 
Cancer cliabrus, Linn4, Mus. Lud. Ulrici, p. 438, 1764; Sysfc. Nat., ed. xii. p. 1044, 1766. 
Plagusia chabrus, White, Ann. and Mag. Nat. Hist., vol. xvii. p. 497, 1846. 
,, ,, Miers, tom. cit., p. 152, 1878. 
,, tomentosa, Milne Edwards, Hist. Nat. Crust., vol. ii. p. 92, 1837; Ann. d. Sci. Nat., 
ser. 3, Zool., vol. xx. p. 178, 1853. 
„ „ Krauss, Die Siid-Afrik. Crust., p. 42, pL ii. fig. 6, 1843. 
South Africa, Simon’s Bay, 10 to 20 fathoms (an adult male and a young example). 2 
Adult 3 ■ 
Lines. 
Millims. 
Length of carapace, .... 
19 
40’5 
Breadth of carapace, about 
21 
44 
1 The British Museum has lately received specimens of the very distinct Plagusia speciosa, Dana (of which I had 
seen no specimens when I revised the species of this subfamily in 1877), from Paumotu. 
2 In the South African specimens of this species, which I have examined, the branchial regions are smooth, or very 
nearly so; in specimens from New Zealand they bear several small ridges or tubercles near the posterior lateral angles, 
but I do not think this to be a character of specific importance, though a larger series might show it to be so. 
(zool. chall. exp. — PART xlix. — 1886.) Ccc 35 
